21422551225 has 12 divisors (see below), whose sum is σ = 26566970860. Its totient is φ = 17136100800.

The previous prime is 21422551211. The next prime is 21422551229. The reversal of 21422551225 is 52215522412.

It can be written as a sum of positive squares in 6 ways, for example, as 2138507536 + 19284043689 = 46244^2 + 138867^2 .

It is not a de Polignac number, because 21422551225 - 2⁵ = 21422551193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21422551229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202135 + ... + 289315.

Almost surely, 2^21422551225 is an apocalyptic number.

21422551225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21422551225 is a deficient number, since it is larger than the sum of its proper divisors (5144419635).

21422551225 is an equidigital number, since it uses as much as digits as its factorization.

21422551225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97020 (or 97015 counting only the distinct ones).

The product of its digits is 16000, while the sum is 31.

The spelling of 21422551225 in words is "twenty-one billion, four hundred twenty-two million, five hundred fifty-one thousand, two hundred twenty-five".